Method for improving industrial-grade ammonium vanadate quality

An ammonium metavanadate, industrial-grade technology, applied in chemical instruments and methods, vanadium compounds, inorganic chemistry, etc., can solve the problems of high impurity metal ions, no analysis data, and difficulty in solving impurity metal ions, and achieve stable product quality. , good impurity removal effect, obvious effect of impurity removal

Active Publication Date: 2014-04-09
SINOPHARM CHEM REAGENT
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Problems solved by technology

[0005] Chinese patent CN102430266A uses vanadium-containing solution as raw material, uses acidic cation exchange resin to absorb impurities, then adjusts the pH value with ammonia water, adds ammonium bicarbonate to crystallize ammonium metavanadate, and achieves the purpose of improving the quality of industrial grade ammonium metavanadate, but The impurity metal ion in the ammonium metavanadate product that adopts this method to obtain is on the high side
[0006] Chinese patents CN102531054A and CN102730757A use industrial-grade ammonium metavanadate as raw material, add magnesium chloride, calcium chloride, calcium nitrate, magnesium sulfate and other impurity removers after dissolving, and then crystallize to obtain ammonium metavanadate products. The quality of ammonium vanadate introduces new impurities at the same time, it is difficult to solve the problem of high impurity metal ions
The target products of the above two patents all use vanadium pentoxide and ammonium metavanadate as intermediates, and there is no specific analysis data

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] 100g of technical grade ammonium metavanadate was dissolved in 2000ml of 10wt% ammonia water at normal temperature, 2g of ammonium sulfate was added under stirring, and the feed liquid was adsorbed by a D201 type strongly basic anion exchange resin column at a rate of 2 times of column volume / hour. The feed liquid after adsorption was heated up to 40°C, 200g of ammonium chloride was added under stirring, and the temperature was lowered to 5°C after dissolving, and the precipitated crystals were filtered and washed twice with 10wt% ammonia water at 5°C, 20ml / time, and then washed with 5°C The high-purity water with a specific impedance greater than 17M? cm was washed twice, 200ml / time, and the obtained solid phase was ventilated and dried at 20-30°C to obtain 84g of ammonium metavanadate product with improved quality.

Embodiment 2

[0026] 100g of technical grade ammonium metavanadate was dissolved in 3000ml of 2wt% ammonia water at normal temperature, 10g of ammonium sulfate was added under stirring, and the feed liquid was adsorbed by a D201 type strongly basic anion exchange resin column at a rate of 4 times column volume / hour. The temperature of the adsorbed feed liquid was raised to 50°C, and 500g of ammonium chloride was added under stirring, and the temperature was lowered to 0°C after dissolving. High-purity water with an impedance greater than 17MΩ·cm was washed twice, 300ml / time, and the obtained solid phase was ventilated and dried at 20-30°C to obtain 81g of ammonium metavanadate product with improved quality.

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Abstract

The invention discloses a method for improving industrial-grade ammonium vanadate quality. The method comprises the following steps: by taking industrial-grade ammonium vanadate as a raw material, dissolving in low-concentration ammonium hydroxide; removing impurities by ammonium sulfate; adsorbing collected feed liquid by strongly basic anion exchange resin, and adding ammonium chloride to dissolve; separating out crystal under cooling; filtering, washing and drying, so as to obtain the ammonium vanadate with improved quality. Impurities metal ions can be effectively removed by using ammonium sulfate edulcoration; new impurities metal ions are avoided; the quality of the final product is ensured by absorption of the strongly basic anion exchange resin; the content of the impurity metal ions in the obtained ammonium vanadate is lower than 5ppm; the purity of the ammonium vanadate can be up to 99.5% or more after the quality is improved; the product quality can be up to the standard of the HG / T3445-2003 reagent-grade ammonium vanadate. Therefore, the method is applicable to industrial production.

Description

technical field [0001] The invention relates to a method for improving the quality of industrial-grade ammonium metavanadate, in particular to a method for improving the quality of ammonium metavanadate by using ammonium sulfate for impurity removal and strong basic anion exchange resin adsorption. Background technique [0002] Ammonium metavanadate is a widely used inorganic salt, mainly used as chemical reagent, catalyst, drier, mordant, etc. It is widely used as glaze in ceramic industry. Ammonium metavanadate is also used in the synthesis of high-purity vanadium pentoxide. raw material. With the development of science and technology, the quality control requirements for ammonium metavanadate are more stringent, so it is inevitable to develop reagent grade ammonium metavanadate to improve the quality of ammonium metavanadate products. [0003] There are two conventional industrial production methods for ammonium metavanadate: one is to use alkaline hydrolysis, mix ferrov...

Claims

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Application Information

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IPC IPC(8): C01G31/00
Inventor 顾小焱郑琦陈浩云胡鸣干海平
Owner SINOPHARM CHEM REAGENT
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